Revolution counter for rotating bodies



Aug. 26. 1924. 1,506,461

K. J. SVENSSON ET AL REVOLUTION COUNTER FOR ROT'ATING BODIES Filed Ausl.13. 1923 Patented Aug. 26, 1924.

UNITED STATES PATENT OFFICE.

KARL JOHAN SVENSSON AND KARL .AXEL PATRIK NORLING, OF LONDON, ENGLAND.

REVOLUTION COUNTER FOR ROTATING BODIES.

Application filed August 13, 1923. Serial No. 657,175.

To all whom t may concern.'

Be it known that we, KARL JOHAN SvENssoN, formerly of Lidingo, Sweden,and KARL AXEL Parnu; NoRLrNG, formerly of Skondalsbro, Sweden, now bothof 1G lVoburn Square, London, lV. C., England, subjects of the King ofSweden, have invented certain new and useful Improvements in or Relatingto Revolution Counters for Rotating Bodies, of which the following is aspecifica-tion. p

It is often desirable and even important to have on a machine withrapidly rotating parts means for enabling the speed of such parts to beascertained and for this purpose simple revolution counters aregenerally employed consisting of gearing for reducing the speed toenable the number of revolutions per time-unit to be counted directly,or of a bell the clapper of which is connected with gearing so that itstrikes the bell at every revolution of the gearing. Alternatively, useis often made of a ,so-called touch-peg or pinion, adapted to bearagainst a heel, cam or like projection from a gear-wheel or its shaft,and to which is imparted a pronounced movement for every revolution ofthe wheel. By pressing ones hand or fingers against this touch-peg orpinion, one can easily count the numberof impulses per time-unit, and asthe gear ratio of the revolution counter is known the speed of therotating machine part can be ascertained easily.

In such revolution counters with a touchpeg or pinion as used heretoforethe touche peg or pinion bears against the said heel or cam only so longas it is pressed, i. e. it is disconnected when the revolution counteris not in use, but on the other hand the gearing of the revolutioncounter runs continuously so long as the machine is at work.

The present invention relates to a revolution counter having a touch-pegor pinion and has for its object to obviate the disadvantages, such asundue wear, arising from the continuous intermeshing and running ofthegearing for actuating said touch-peg or pmion.

To this end and in accordance with this invention one of the wheels ofthe gearing is adapted to be put into driving engagement only whenpressure is brought to bear upon a touch-peg or the like, and to bedisconnected automatically as soon as such pressure is released, i. e.the gearing runs only during such time as the revolution counter isactually in use. For this purpose the gear wheel is normally held out ofdriving connection by a spring or in the case of a gearwheel withhelical or like teeth by the axial pressure caused thereby between theintermeshed wheels, driving engagement between the wheels being broughtabout by pressure of the hand upon the touch-peg or the like.

ln the accompanying drawings Figure l is a sectional side elevation ofone form of the invention in which the drive is effected through wormgearing and Figure 2 is a section on the line 2 2, Figure l, whilstFigure 3 is a sectional side elevation of a modified construction inwhich the drive is effected through spur gearing.

ln all the figures l denotes the rotary machine part the speed of whichis to be meas ured, 2 the case or housing of the revolution counter', 3the driving gear wheel (worm in Figures l and 2 and spur in Figure 3)mounted axially on the rotary machine part l. 4 is an axially slidabledriven gear-wheel with an inclined heel or ramp 5, b is the socalledtouchjpeg with its inclined heel or ramp 7, `whilst 8 is a coiled springadapted normally to press the gear wheel 4. out of mesh with the worm orpinion 3 as the case may be. 9 is a screw or key projecting into agroove l0 in the touch-peg G to prevent the latter from turning, and llis the shaft for the axially slidable driven gear wheel Ll.

lt is to be observed that the gear wheel 4. is brought into mesh withthe worm or pin ion 3, as the case may be, only when the touch-peg G ispressed inwards against the action of the spring 8 consequently there isdriving engagement only when the counting mechanism is to be used withthe result that undue wear of idly driven gearing is entirely obviated.

W'e claim l. A revoluion counter comprising gear wheels, a so-calledtouch-peg means for imparting to said touch-peg a pronounced impulse perrevolution of a gear wheel in the mechanism when said touclrpeg ispressed, means for bringing one of said. gear wheels into engagementwith its driving member only when pressure is applied to the touch peg7and for disengaging said gear wheel from its driving' member when thepressure applied to the touch peg is released, substantially as setforth.

2. A revolution counter for measuring the number' o't' revolutions ofrotary machine parts and litted with gearing as well as a so-calledtouch-peg a projection on a rotary member adapted to coact with saidtouch-peg and thus to impart to it a pronounced impulse per revolutionot' said rotary member, whereby the number of revolutions oit the rotarymachine part per time-unit can be ascertained when the gear ratio ot therevolution counter is known, a driven gear wheel which runs free of thedriving wheel when the revolution counter is not in use and meansadapted, when pressure is applied to the touch-peg to cause the drivengear wheel to mesh with the driving wheel byshitting said driven wheelin an axial direction, and adapted, as soon as the pressure applied tothe touch-peg is released, to permit said driven wheel to be disengagedfrom said driving wheel by being shifted far enough, in an axialdirection towards the touch-peg, to be 'tree of said driving wheel.

3. A revolution counter lor measuring the number of revolutions ot'rotary machine parts and iitted with gearing as well as a so-calledtouch-peg a projection on a rotary member adapted to coact with saidtouch-peg and thus yto impartto it, a pronouneed impulse per revolutionot said rotary member, whereby the number ol2 revolutions ot the rotarymachine part per time-unit can be ascertained when the gear ratio oi:the revolution counter is known, a driven gear wheel which runs free ofthe driving wheel when the revolution counter is not in use and a springexerting a lateral thrust on said. driven wheel in the direction oit thetouch-peg and tending always to disengage the driven wheel from thedriving wheel by sliding the former in an axial direction towards thetouch-peg lthereby throwing the gear ot the revolution counter out otaction except when the latter is brought into use by applying pres-`sure to the touch-peg.

Il. A revolution counter for measuring the number oit revolutions ofrotary machine parts and fitted with gearing, in which there is an axialthrust existing between the various members thereof, as well as asoealled touch-peg, which coacts with a projection on a rotary memberand thus has imparted to it a pronounced impulse per revolution ot saidrotary member, whereby the number ot revolutions olf the rotary machinepart per time-unit can be ascertained when the gear ratio of therevolution counter is known, a driven gear wheel which runs free ot thedriving wheel when the revolution counter is not in use, and meansadapted to cause the axial thrustbctween the members of the gearing totend always to disengage the driven wheel from the driving wheel bysliding the former in an axial direction towards the touch-peg therebythrowing the gear olI the revolution counter out oi action except whenthe latter is brought into use by applying pressure to the touch-peg.

5. A revolution counter tor measuring the number of revolutions ofrotary machine parts and fitted with gearing, in which there is an axialthrust existing between the various members thereof, as well as asocalled touch-peg, which coacts with. a projection on a rotary memberand thus has imparted to it a prounounced impulse per revolution ol saidrotary member, whereby the number of revolutions of the rotary machinepart per time-unit can be ascertained when the gearratio ot therevolution counter is known, a driven gear wheel which runs free ot thedriving wheel when the revolution counter is not in use, and meansadapted to cause the axial thrust between the members of the gearing inconjunction with the thrust ot a spring to tend always to discngage thedriven wheel from the driving wheel by sliding the former in an axialdirection towards the. touch-peg thereby throwing the gear ot' therevolution counter out ol' action except when the latter is brought intouse by applying pressure to the touch-peg.

KARL JOHAN SVENSSON. KARL AXEL PATRIK NORLING.

